What type of cancer did Erik Cassel have?

What type of cancer did Erik Cassel have? Imagine how hard it would be for him to design a game, and help others when he had brain cancer. Also even tough he had brain cancer he was still kind and patient. He answers other questions without being annoyed. His children even built him a memorial at his game.

Imagine how hard it would be for him to design a game, and help others when he had brain cancer. Also even tough he had brain cancer he was still kind and patient. He answers other questions without being annoyed. His children even built him a memorial at his game.
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